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Thread: 750w for GTX580

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    750w for GTX580

    Hi, will a 750w psu be enough for 2x GTX580's?

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    Re: 750w for GTX580

    It depends what PSU is it?
    Because most 750w Power Supply's will power 2 580s if you don't overclock them, but some old ones cant power dual 580s you can check on NVIDIA's SLI zone for certified Power Supply's. Though i would recommend to upgrade to a 850w or even and 1000w PSU because its not good to put high stress on a Power Supply as it wont live as long.

    Thank you for your time, Regards Rob

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    Re: 750w for GTX580

    TDP of a 580 is 244w
    So 2 of them are 488w

    750w @ 80% efficiency = 600W

    600-488 = 102w spare for the rest of the system based on both gfx cards being at 100% utilisation.

    So, for a full system 750w is cutting it too fine IMO. An 850w would be a lot better and give room for overclocking.
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    Re: 750w for GTX580

    Why 80% efficiency? Wattage is rated for supply to components, not at the wall. If the components need 500W then any efficiency 500W supply will provide it - it'll just take 1/efficiency x the draw from the wall.

    Ie, a 600W supply would be fine.

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    Re: 750w for GTX580

    Quote Originally Posted by Qazteck View Post
    It depends what PSU is it?
    Up to this point that advice is great

    Bottom line is it depends which 750W PSU not because of age or specification, but because if you're looking at a generic no-name 750W PSU then the chances are it can't provide half of its rated wattage for more than about a second, and certainly not within ATX specifications. There's a reason that big-name branded 750W PSU all cost well over £50, and that's because you can't *make* a decent 750W PSU for much less than that, let alone sell one for that little!

    So, look around at some figures. Recent Hexus reviews show an i7 980X platform + 2x GTX580 draws over 600W in gameplay, but that's from the wall. Factor in PSU efficiency - even at a generous 90% - and that figures comes down below 550W.

    Anther factor is the rest of your system. Hexus' figures were based on an i7 980X / X58 platform that is known to be quite power-hungry. Different components would give a different overall power draw (although tbh once you've got 2 GTX580s in a system most of the power draw is coming from the GFX).

    Finally, whilst it might not be critical to your thinking, it's worth considering efficiency. PSUs tend to be significantly less efficient when running below 20% of their rated load, and modern PCs idle at very low power draws. So if you often use your gaming PC for web browsing and office work, a slightly lower rated PSU will be much more efficient whilst you've not got those dual GTX580s loaded up.



    tl;dr? A 750W PSU will be fine as long as you get a decent, branded one, but you might want to take other factors into consideration

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    Re: 750w for GTX580

    Quote Originally Posted by kalniel View Post
    Why 80% efficiency? Wattage is rated for supply to components, not at the wall. If the components need 500W then any efficiency 500W supply will provide it - it'll just take 1/efficiency x the draw from the wall.

    Ie, a 600W supply would be fine.
    Ah, didn't realise that - ta.

    Still, 600w is surely not enough....the gfx cards alone are rated at 244w each by nVidia.....100w for the rest of the system is not going to happen, unless it's a system that really should not have a single GTX580, let alone 2!
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    Re: 750w for GTX580

    Quote Originally Posted by shaithis View Post
    Still, 600w is surely not enough....
    Quote Originally Posted by scaryjim View Post
    ... Recent Hexus reviews show an i7 980X platform + 2x GTX580 draws over 600W in gameplay, but that's from the wall. Factor in PSU efficiency - even at a generous 90% - and that figures comes down below 550W.
    As mentioned, that's Hexus' old high end test-bed: i7 980X / X58 based: known to be a power hog in its own right. The chances of getting a pair of 580s fully loaded playing a recent game is minimal, and the chances of getting both GPUs and the CPU fully loaded in regular usage is... well, I'd say inconceivable, but someone would start quoting The Princess Bride at me. If we assume that the underlying system is going to be something less power-hungry than a hex-core i7 on X58 (say, an i5 2500K on a Z68 mobo), and also that the Hexus PSU wasn't running at my generous 90% efficiency, then a 600W PSU would be *sufficient*.

    Of course, if the OP wants to clock their GTX580s to the nines, ramp their CPU up to 5GHz, then run dual GPU furmark whilst folding on the remaining 10 threads of their i7 990X CPU, a 600W PSU probably wouldn't do the trick - but that's not what the OP asked. If they just want to play recent games on 2 stock-clocked GTX580s in a stock-clocked system, a good quality 600W PSU would do the trick. A 750W PSU will give them headroom for some modest overclocks, if that's the way they decide to go.

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    Re: 750w for GTX580

    Well, whatever he decides, I would not risk that amount of kit on a hexus review which may or may not have fully loaded the system......a review which I am guessing was done pre-BF3!
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    Re: 750w for GTX580

    i would adivce you 800 watt. Having your PSU on load all the tiem at 600+ watt isnt good . Your suppose to split the load of the current . This way your not overloading the circuit and the hardware.

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